charges of `20nC` each are placed at the corners A and B of a square ABCD of side `sqrt(8)cm` and charges of `-10nC` at the corners C and D. find the
charges of `20nC` each are placed at the corners A and B of a square ABCD of side `sqrt(8)cm` and charges of `-10nC` at the corners C and D. find the potential at the centre of the square.
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